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MEDICAL NOW No.74 (2013.8)

R/F

Development of the OPESCOPE ACTENO

Medical Systems Division, Shimadzu Corporation

Shouji Takamura, Takeshi Okamoto, Shinsuke Kanazawa, Go Takayanagi,

Shinichiro Mori, Yoshiaki Tanaka, Yoshihiro Atsumi, Tatsuya Shimizu, Atsuhiro Hattori

1. Introduction

The OPESCOPE Series Surgical Mobile C-Arm

System offers:

C-arm cart construction with no protruding

cables

Fully manual positioning, including vertical

movements

Pulsed fluoroscopy at 15 fps

This leads to following points that contribute to the

popularity of the system:

Sterile and compact

Rapid positioning operations

High image quality but low X-ray exposure

dose

Shimadzu has developed the new OPESCOPE

ACTENO range that further builds on the previous

functions.

In this paper, we introduce the range of advanced

functions offered by ACTENO, including:

Fluoroscopic image display functionality

added to the C-arm cart for all models

Extended distance from X-ray tube to I.I.

Narrower C-arm cart body

More compact monitor cart

Folding monitors to save space

1-megapixel TV camera as standard for higher

image quality

Boost-pulsed fluoroscopy as standard is a

powerful tool for imaging thick objects, such

as lateral radiography of the lumbar spine

Virtual collimation further reduces X-ray

exposure

Realtime dose and cumulative dose monitor

display functions (the demand for which is

likely to grow in the future).

Fig. 1 OPESCOPE ACTENO

2. Basic Specifications and Development Topics

Table 1summarizes the ACTENO basic specifications.

The most important factors in the field of orthopedics,

in particular, are quick operation and high image

quality. The features and functions of ACTENO are

described below.

X-ray tubecapacity

100 kHU fixed anode(0.6 mm focal point)

CCD camera 1000 1000, 12 bit

Imageintensifier 9/6-inch, 2 field of view switchable, or6/4-inch, 2 field of view switchable

Fluoroscopymode (1)

Continuous fluoroscopy, orPulsed fluoroscopy(15 fps max.)

Fluoroscopymode (2)

Normal or Low Dose

C-arm operation Fully manual positioning, includingvertical motions(Fully counterbalanced)

Virtual operation Image rotation, collimator operation(Operations from C-arm cart)

Monitors 19-inch LCD, 1 or 2 monitors

IBS(Image BrightnessStabilizer)

Fixed at center of region of interest, orPredicted region of interest

Table 1 OPESCOPE ACTENO Major Specifications

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MEDICAL NOW No.74 (2013.8)

2.1 Improved C-arm Operation

C-arm positioning follows the popular fully

counterbalanced manual positioning method,

including vertical motions. This method ensures

rapid positioning. The greater 780 mm distance

from the X-ray tube cover surface to I.I. (previously

700 mm) and the wider 670 mm C-arm depth(previously 660 mm) enhance the freedom of

positioning. The width of the C-arm cart body has

been reduced from 880 mm to 800 mm, making

it more maneuverable.

An optional handle

with C-arm lock-release

button is available at

the I.I. side to exploit

the benefits of the fully

counterbalanced OPESCOPE

manual positioning. Itallows the operator to

temporarily release the

C-arm lock to position

the C-arm as required

(Fig. 2).

2.2 Improvements to the Monitor Cart

Improvements have also been made to the monitor

cart. A monitor vertical movement / swing adjustment

mechanism and folding mechanism for twin

monitors can be added as monitor supportoptions. The vertical movement adjustment

mechanism allows the monitor height to be

adjusted to match the operator's line of sight

(Fig. 3). The swing adjustment mechanism permits

fine adjustment of the monitor orientation, without

moving the monitor cart. The folding mechanism

improves visibility during travel and reduces

storage space requirements(Fig. 4).

2.3 High Image Quality (One Megapixel)

ACTENO features a 1-megapixel CCD camera.The Normal, Low Dose 1, Low Dose 2, High

Quality, and Boost Pulse (short-burst increases

in X-ray output for patients with high body

thickness) exposure dose modes combined with a

pulse rate to 15 fps allow the optimal fluoroscopy

condition to be selected for the region and

procedure. The camera offers detailed images over

a larger field of view.

The image stability is also improved. To maintain

constant system sensitivity and minimize the

effects of noise, sophisticated control circuitry hasbeen added to the Image Brightness Stabilizer

(IBS) that automatically controls the X-ray

conditions. In addition, the Auto Window Level

Control (AWC) function performs realtime

processing according to the pixel value histogram

of the displayed image to automatically adjust the

image gradation and display images with stable

density.

The system also permits density adjustment to

match the user's preferences by push-button

operation. The brightness buttons added to the

C-arm cart operating console allow rapid adjustment

of the density in seven steps from -2 to +4 (Fig. 5).

Fig. 5 Brightness Buttons

Fig. 2 Handle with C-arm

Lock-Release Button

Fig. 3 Monitor Cart Vertical Movement

Adjustment Mechanism

Fig. 4 Monitor Cart Folding Mechanism

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MEDICAL NOW No.74 (2013.8)

2.4 New Communications Control Method

Improvements have also been made to the cart

cable that connects the C-arm cart to the monitor

cart, which has to be installed, cleaned, and stored

for each procedure.

The cart cable handles power supply and transmission

of image data and other data. It contains multiplecables for different applications combined in a

complex manner. In the past, this inevitably resulted

in a thick and heavy cable which was difficult to

route.

In addition, data traffic is now significantly heavier

than previous systems to support the realtime

display of exposure dose and other information.

ACTENO adopts a new high-speed communication

control method that supports higher speeds and

multiplexing. It results in a lighter cable that is only

two-thirds the previous diameter, and makes itmuch easier to handle the cart cable.

2.5 Virtual Operations Contribute to Reduced

Exposure

ACTENO offers virtual operations as standard.

Mobile C-arm systems generally require an image

rotation function, as there is no way to determine

the direction in which fluoroscopy was performed

with respect to the patient. Therefore, the image

rotation position needs to be determined prior to

treatment (and during the treatment, if the fluoroscopydirection changed). The virtual image rotation and

virtual collimator functions provide powerful tools to

minimize X-ray exposure dose during this operation.

The operation is as follows. Virtual operations on

the Last Image Hold (LIH) image displayed on the

monitor perform image rotation with respect to the

C-arm cart, vertical and horizontal inversion,

octagonal collimator insertion, and opening, closing,

and rotation of the parallel hole collimator (Fig. 6).

This image is then reproduced when fluoroscopy is

performed (Fig. 7).

2.6 New Exposure Dose Display Function

The X-ray dose management functions have

been enhanced to meet the demands for stricter

management of exposure dose in recent years. The

X-ray conditions during fluoroscopy and size of

collimator opening are monitored. This information

is used to work out the calculated dose per unit area,

which is displayed on the image monitor in realtime

(Fig. 8). By installing the optional area dosimeter,

the display can be changed to indicate the actualexposure dose.

ACTENO meets the stringent requirements for

exposure dose management in the 3rd Edition of

the IEC60601 standard.

Fig. 6 Virtual Collimation Setting Screen

Fig. 7 Fluoroscopy Screen after Virtual Collimation

Fig. 8 Exposure Dose Display

3. Conclusions

This paper introduced the OPESCOPE ACTENO

Surgical Mobile C-Arm Imaging System. It inherits

the fully counterbalanced C-arm vertical motion

and cableless construction of previous models,

with new features to improve fluoroscopic image

quality and reduce X-ray exposure dose. You will

find that the OPESCOPE ACTENO is even easier

to use.